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"These values are quantified from differences in position between pairs of scans by dividing the standard deviation of the differences by sqrt(2). The values for motion of the pelvic bone relative to the table indicate the setup deviations on the scanner. The statistics for left and right femora have been combined. Because rotations are described around the center of gravity of the applied leg contours, rotations around the joint induce translations as well. The prostate is fairly stable, except for translations in the A-P direction and rotations around the L-R axis. For most parameters, measurement errors are well below the observed variations. Reprinted from Int J Radiat Oncol Biol Phys, 33, van Herk M, Bruce A, Kroes S, Shouman T, Touw A, Lebesque JV. Quantification of organ motion during conformal radiotherapy of the prostate by three-dimensional image registration, 1311-1320, copyright 1995, with permission from Elsevier Science.

parameters: accuracy and reproducibility, and reliability and capture range.